"Apple Inc reported quarterly revenue that slightly missed Wall Street expectations as sales of its flagship iPhone came in below target, sending its shares down more than 4 percent. The world's largest technology company shipped 47.8 million iPhones, lower than the roughly 50 million that Wall Street analysts had predicted. Sales of the iPad came in at 22.9 million in the fiscal first quarter, about in line with forecasts." I'll leave the financials to the experts, but one thing that stood out to me: Apple sold 4.2 million Macs, almost a million below expectations. How much of a future does desktop computing have at Apple? Update: The NYT/Reuters changed the title during the night. Fixed it.

No they weren't. Nexus 4 is constrained, iPhone5 is not.
They sold ~15 million more iOS devices but made only 40mil more profit compared to last year.

They said they were constrained. Do you think they were lying?

Secondly, Q1 2013 was one week shorter than Q1 2012. Like for like, they might have been able to push up the profit number to $14bn.

Yes, margins are down. They are selling a larger number of lower margin products. And Q1 2012 was particularly good, perhaps anomalously so. Their margin are nearer to their usual level in Q1 2013 (Gross margin was 38.5% for Q1 2011, and 40.9% for Q1 2010). Q1 2012 gross margin was anomalously high at 44.7%, and that was not likely to be repeated.